The centre is set to stay with Connacht until the summer of 2025.
Aki first joined the westerners in 2014 and helped the province win the PRO12 title in 2016.
He made his Irish debut in 2017, and was a central player to Ireland's Grand Slam win back in March.
He has been nominated for this year's World Player of the Year award, alongside Irish coach Andy Farrell up for Coach of the Year gong.
Naas' Jamie Osborne Ruled Out Of Saturday's Autumn Nations Finale Against Australia
He's been ruled out along with Ryan Baird, Tadhg Furlong and Jacob Stockdale
Munster's Denis Leamy Signs Two-Year Contract Extension As Defence Coach
The former Ireland international is in his third season as defence coach.
Man City & Arsenal In Champions League Action Tonight
Both their games kick off at 8pm
Tuesday's GAA: Clane Play Sarsfields In U23 'F' Final
Last night, Celbridge beat Maynooth in the 'A' Semi Final
Caragh To Play Dublin's Naomh Mearnóg In Intermediate Final
Caragh beat St Mogue's on Saturday
Moyes & Potter Among The Names In Contention For Leicester Job
Steve Cooper was sacked over the weekend
Eadestown's Tadhg Beirne Named In Men's Team of the Year
Erin King won Women's Breakthrough Player of the Year
Ireland Picked Up Their Second Win Of This Year's Autumn Nations Series
Andy Farrell's men looked impressive as they beat an ill-disciplined Fiji by 52 points to 17 at the Aviva Stadium last night.
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